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Apple has kept the same 38mm and 42mm watch face sizings, but he 4G version has a new red digital crown, and Apple has also introduced a new sport loop strap along with a variety of new colours across existing designs.

Features

The new WatchOS 4 software, which Apple previewed at its WWDC event in June, will feature an updated Heart Rate app.

Apple has boosted the heart rate tracking capabilities of the watch so that it notifies the user if their rate is high when they don't appear to be active.